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WITNES ES W A. A. BURR'. Saw.

Patented Mar. 23, 1880.

INVBNTOR: Z. W m/ BY w ORNEYS.

UNITED STATES PATENT OFFICE.

AMOS A. BUR-R, OF ROGKDALE, NEW YORK.

SAW.

SPEGIFICATION forming' part of Letters Patent No. 225,795, dated. March23, 1880.

Application filed December 18, 1879.

To all whom it may concert,

Be it known that I, AMOS A.BURR, of Rockdale, in the county of Ghenangoand State of New York, have invented a new and useful Improvement inSaws, of which the following is a specification.

The figure is a side elevation of a portion of a saW, showing theimprovement.

The object of this invention is to furnish saws so con structcd thatthey cannot beforced forward, should their teeth strike a knot or otherhard spot in the Wood, so far that they cannot be forced through theWood.

The invention consists in constructing the Cutting-teeth withchisel-points and inclined lower or forward edges, and With guards ot' aless height than the cutting-teeth between the pairs of cutting-teeth,so that the saws cannot be thrown so far forward that the cuttingteethcannot be forccd through the Wood, as will be hereinafter fullydescrihed.

A represents the saw-blade. B are the cutting-teeth, which are designedto be set in the usual way.

The teeth B are made with chisel-points and with their lower or forwardedges inclined, as shown in the figure. Vith teeth thus constructcd,should the points of the teeth strike a knot or other hard spot in theWood they Will be thrown forward, so thatthey cannot be forced throughthe Wood, and the saw Will be broken. To guard against this difticulty Iform guards O between the pairs of cuttingteeth B. The gnards O areronnd-pointed, made without Cutting` points or edges,'and of such alength that the cutting-teeth B will project beyond the said guards sofar as it is desired to have the said teeth B enter the Wood.

W'ith this construction, should the teeth B strike a knot or other hardspot in the Wood and be thrown forward, the guards U will come incontact with the hottom of the kerf, and Will thus prevent the teeth Bfrom entering the Wood so far that they cannot be forced through it.

I am aware that clearing-teeth have been arran gcd between pairs ofCutting-teeth in a saw; but these extend nearly to the full depth of thecutting-teeth, or they would be of 'little avail.

That I claim as new is- The combination, With the pairs of cuttingteethB B, having chisel-points and forwardlyinclined lower edgcs, ot' atooth-guard, O, made hlunt or rounded at the point, reaching` only tothe plane to which the Cutting-teeth, extend into the Wood, and arrangedbetween each pair of cutting-teeth, as shown and described.

AMOS ALCOTT BURR.

VVitnesses:

GEO. W. WoosTER, EVERETT J AY.

